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Method for temporary plugging and layering reconstruction of gas well and application

A technology of gas well and temporary plugging agent, which is applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc. It can solve the problems of multiple construction procedures, difficult operation and high cost of isolation tools, so as to reduce operation cost and process Less, the effect of increasing yield

Inactive Publication Date: 2018-07-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of many isolation tools required for transformation and complex construction procedures, high cost and difficult operation in existing gas field transformation methods

Method used

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Examples

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preparation example Construction

[0048] The preparation method of described soluble temporary plugging agent, comprises the following steps:

[0049] Mix the high polymer and vegetable starch evenly, add the mixture of expansion agent and curing agent, stir until the mixture is even, and obtain the raw material mixture;

[0050] Put the raw material mixture in a rectangular container with a length of 1m, a width of 0.5m, and a height of 1cm, apply a layer of lubricating oil, spread it into a cake shape with a thickness of 5mm to 10mm, let it dry naturally, and then form it with a diameter of 3- 6mm particles to obtain the soluble temporary plugging agent.

[0051] An application of a method for temporary plugging and layering reformation of gas wells. The method for temporary plugging and layering reformation of gas wells is suitable for infinite layered reformation of multi-layer systems and vertical directional wells in low-permeability gas fields.

[0052] Among them, the perforating guns are lowered to 1...

Embodiment 1

[0054] A vertical well in a gas field in Changqing was revamped with this temporary plugging and staged fracturing method. The target layer is 3 layers, the fracture pressure of the formation is 50MPa, and the pressure rating of the perforating gun and cable is greater than 50MPa. The construction steps are as follows:

[0055]Step 1: The first layer of perforated gas well with pressure perforated through casing cable transmission;

[0056] Step 2: The perforating gun is lowered to 10m below the perforation section, and the wellhead cable is kept under pressure;

[0057] Step 3: Measures to transform the first floor;

[0058] Step 4: Displacing liquid pumps soluble temporary plugging agent, with a displacement of 1.0-1.5 m³ / min;

[0059] Step 5: Lift the perforating gun to the second floor after judging that the temporary plugging is successful;

[0060] Step 6: Perforate the second layer, repeat step 2-step 5 until the reconstruction of the third layer of the well is comple...

Embodiment 2

[0065] A directional well in the Sulige East District of Changqing Gas Field adopts this temporary plugging and staged fracturing technology to stimulate 4 layers. The fracture pressure of the formation is 61MPa, and the pressure resistance of the perforating gun and the cable can be greater than 61MPa. The construction steps are as follows:

[0066] Step 1: The first layer of perforated gas well with pressure perforated through casing cable transmission;

[0067] Step 2: The perforating gun is lowered to 10m below the perforation section, and the wellhead cable is kept under pressure;

[0068] Step 3: Measures to transform the first floor;

[0069] Step 4: The displacement fluid pumps the soluble temporary plugging agent at a displacement of 1.5-2.5 cubic meters per minute;

[0070] Step 5: Lift the perforating gun to the second floor after judging that the temporary plugging is successful;

[0071] Step 6: Perforate the second layer, repeat steps 2-5 until the 4th layer o...

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Abstract

The invention provides a method for temporary plugging and layering reconstruction of a gas well and an application, and belongs to the field of low-permeability gas reservoir reconstruction. According to the method, after cable transmission perforates under pressure, a perforating gun is lowered below 10 meters from a perforation section of a layer, a cable of a wellhead is kept under pressure, fracturing / acidizing reconstruction is carried out, a soluble temporary plugging agent is pumped in a displacement fluid stage, and the perforating gun is lift to a second reconstruction point after judging the success of temporary plugging, the steps are repeated until the reconstruction of the well is completed, the perforation gun is lifted up, and liquid is discharged after the temporary plugging agent is dissolved. According to the method, fracturing is carried out after the perforating gun is lowered after perforation, and no packer drilling tool is arranged in a pitshaft, the soluble temporary plugging agent is used for realizing interlayer isolation, infinite layered fracturing reconstruction can be realized, a large drift diameter can meet the requirements of the concept of large displacement reconstruction of reservoirs in recent years, after measures are taken, the full diameter of the pitshaft is also convenient for subsequent pitshaft operations, the operation flow is simple, the cost is reduced, and the efficiency is increased.

Description

technical field [0001] The invention belongs to the field of transformation of low-permeability gas pool reservoirs, and in particular relates to the application of a method for temporary plugging and layering transformation of gas wells, which can realize infinite layered fracturing and acidification transformation of vertical wells or directional wells. Background technique [0002] Vertically multi-layered reservoirs in some gas fields are relatively common, and the proportion of multi-layered wells in one well is high. The main layers are the He 8 Member and Shan 1 Member in the Permian. In addition, the Lower Paleozoic Majiagou Formation and the Upper Paleozoic Taiyuan Formation, Benxi Formation, etc. For example, the Sulige gas field has shown that it has the conditions for multi-layer partial pressure combined production by studying the characteristics of reservoir interlayers, longitudinal stress distribution characteristics, and layered pressure. In the early stage...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B33/13
Inventor 李宪文郝瑞芬张燕明马旭周长静马占国肖元相何明舫史华毕曼问晓勇高伟沈磊韩巧荣
Owner PETROCHINA CO LTD
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